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Daptomycin is highly efficacious against penicillin-resistant and penicillin- and quinolone-resistant pneumococci in

Philippe Cottagnoud1, Marc Pfister, Fernando Acosta

  • 1Department of Internal Medicine, Inselspital, Bern, Switzerland. pcottagn@insel.ch

Antimicrobial Agents and Chemotherapy
|September 25, 2004
PubMed

Insights

Daptomycin effectively penetrates inflamed meninges and shows superior efficacy in treating experimental pneumococcal meningitis, even against resistant strains. This lipopeptide antibiotic demonstrates significant bactericidal activity in cerebrospinal fluid (CSF).

Area of Science:

  • Pharmacology
  • Infectious Diseases
  • Microbiology

Background:

  • Daptomycin is a novel lipopeptide antibiotic.
  • Bacterial meningitis remains a significant global health challenge.
  • Emergence of antibiotic-resistant bacterial strains necessitates new therapeutic strategies.

Purpose of the Study:

  • To evaluate the penetration of daptomycin into inflamed meninges.
  • To assess the efficacy of daptomycin in treating experimental pneumococcal meningitis.
  • To compare daptomycin's performance against resistant Streptococcus pneumoniae strains with standard treatments.

Main Methods:

  • Determined daptomycin penetration into inflamed meninges in an experimental model.
  • Measured the reduction in bacterial titer (CFU/ml) in cerebrospinal fluid (CSF) after daptomycin treatment.
  • Compared daptomycin efficacy against penicillin- and quinolone-resistant Streptococcus pneumoniae with ceftriaxone and vancomycin combination therapy.
  • Assessed in vitro bactericidal activity of daptomycin at various concentrations above the minimum inhibitory concentration (MIC).

Main Results:

  • Daptomycin penetration into inflamed meninges ranged from 4.37% to 7.53% (mean 5.97%).
  • Daptomycin treatment resulted in significant bacterial titer reduction in CSF for both penicillin-resistant (-1.20 log(10) CFU/ml·h) and multi-drug resistant (-0.97 log(10) CFU/ml·h) Streptococcus pneumoniae strains.
  • Daptomycin demonstrated superior efficacy compared to the standard ceftriaxone/vancomycin regimen, sterilizing 90% of CSF samples within 4 hours.
  • In vitro studies confirmed highly bactericidal activity of daptomycin at concentrations above the MIC.

Conclusions:

  • Daptomycin exhibits promising penetration into inflamed meninges.
  • Daptomycin is highly efficacious in treating experimental pneumococcal meningitis, outperforming current standard-of-care treatments, especially against resistant strains.
  • The findings support daptomycin as a potential therapeutic option for bacterial meningitis caused by resistant Streptococcus pneumoniae.

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